23 March 2021

Things got out of control with the all-valve TX project

The more I read about valve (vacuum tube) oscillators and transmitters, the more I understand the inner workings of those relatively simple circuits. Once I realised that a triode-heptode or triode-pentode tube can work both as oscillator and "PA", I concentrated my efforts around a PCL-805. Until my own hands presented me the nest shown in the picture.

One tube CW transmitter (tentative)

Alright. I will take one step back and beam my first venture into the world of vacuum tubes towards two separate stages: the crystal oscillator and the power amplifier. I do have enough tubes and sockets. What I am missing is a decent assortment of high voltage capacitors and high wattage resistors! Let alone RFC!